CVE-2026-16103
EUVD-2026-4522517.07.2026, 17:17
A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| redhat | build_of_keycloak | - |
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= Vulnerable software versions
Common Weakness Enumeration
- CWE-305 - Authentication Bypass by Primary WeaknessThe authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
- CWE-841 - Improper Enforcement of Behavioral WorkflowThe software supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.